A woman runs past steel products stacked at a steelworks in Seoul, South Korea, in this July 15, 2015 file photo. (Photo by Kim Hong-Ji/Reuters)

A worker carries stacks of boxes on his back at the Namdaemun Market in Seoul in this October 26, 2012 file photo. (Photo by Kim Hong-Ji/Reuters)

A cashier uses a customer's credit card to pay for a purchase at a Kyobo bookstore in Seoul in this February 5, 2009 file photo. (Photo by Jo Yong-Hak/Reuters)

A restaurant worker carries a plate on her head as she delivers a food during a lunch time at the Namdaemun Market in Seoul, South Korea, November 24, 2015. (Photo by Kim Hong-Ji/Reuters)

A shopkeeper naps at the Namdaemun Market in Seoul, South Korea, November 24, 2015. (Photo by Kim Hong-Ji/Reuters)

A woman cooks at a border village just south of the demilitarized zone where loudspeakers are installed, in Yeoncheon, South Korea, January 8, 2016. (Photo by Kim Hong-Ji/Reuters)

A boy stands in the sunlight at a border village just south of the demilitarized zone where loudspeakers are installed, in Yeoncheon, South Korea, January 8, 2016. (Photo by Kim Hong-Ji/Reuters)

A woman cooks at a border village just south of the demilitarized zone where loudspeakers are installed, in Yeoncheon, South Korea, January 8, 2016. (Photo by Kim Hong-Ji/Reuters)

A woman rides on an escalator at a shopping mall in Seoul, South Korea, in this June 18, 2015 file photo. (Photo by Kim Hong-Ji/Reuters)

A woman takes photographs of products at an Ikea store in Gwangmyeong, South Korea, February 3, 2016. (Photo by Kim Hong-Ji/Reuters)

A man carries scraps in a handcart during snowfall in central Seoul, South Korea, February 16, 2016. (Photo by Kim Hong-Ji/Reuters)

Tourists walk in the Myeongdong shopping district during snowfall in Seoul, South Korea, February 16, 2016. (Photo by Kim Hong-Ji/Reuters)

A Chinese tourist shares a moment with her child during snowfall in Seoul, South Korea, February 16, 2016. (Photo by Kim Hong-Ji/Reuters)

Children wearing a Korean traditional costume Hanbok wave South Korean national flags during a re-enactment of the Independence Movement Day in Seoul, South Korea, March 1, 2016. (Photo by Kim Hong-Ji/Reuters)

A man collects paper boxes at an entrane of a subway station in central Seoul, South Korea, March 15, 2016. (Photo by Kim Hong-Ji/Reuters)

A man carrying his stuff on a bicycle crosses a zebra crossing in central Seoul, South Korea, March 31, 2016. South Korea's manufacturing activity contracted for a third straight month in March but at a much more moderate rate, suggesting some respite for the struggling trade-reliant economy, a private-sector survey showed on April 1, 2016. (Photo by Kim Hong-Ji/Reuters)

Two women wearing traditional Korean “Hanbok” dresses pose for selfies at Gyeongbokgung palace in central Seoul on March 2, 2016. The Hanbok is usually reserved for festive events and special occasions although tourists visiting popular attractions in Seoul can rent the dresses, which are a familiar sight at the palace. (Photo by Ed Jones/AFP Photo)

A South Korean official wearing a Royal Guard uniform stands guard before the Royal Palace gates during the Royal Guard changing ceremony at Gyeongbokgung Palace in Seoul, South Korea, 30 March 2016. In ancient times, the royal guards of Joseon Dynasty performed the given task by guarding the Gwanghwamun gate, the entrance of Gyeongbokgung Palace, where the king ruled the country. Since 1469, the ceremony has taken place and its record has been consulted for the present reenactment ceremony. (Photo by Jeon Heon-Kyun/EPA)

Young Korean women wearing hanbok (Korean traditional dress) walk inside Gyeongbok Palace on March 27, 2016 in Seoul, South Korea. There has been a trend in recent years for the young Koreans to wear the traditional Korean dress, Hanbok. Wearing the traditional dress, they will walk around downtown Seoul on weekends taking selfies, and share their memories with friends on social media, and also to promote their traditional dress to foreign visitors. (Photo by Jean Chung/Getty Images)

A woman covers her head with a scarf against heavy snow in Seoul, South Korea, February 16, 2016. (Photo by Lee Jin-man/AP Photo)

A couple wearing South Korea's traditional costume “Hanbok” shares a jacket to protect themselves from heavy snow at the 14th-century Gyeongbok Palace, one of South Korea's well known landmarks in Seoul, South Korea, Sunday, February 28, 2016. (Photo by Ahn Young-joon/AP Photo)

A group of students pose for a selfie as they tour the Naksan “art village” wearing 1970's style school uniforms as part of an educational initiative, in Seoul on February 23, 2016. (Photo by Ed Jones/AFP Photo)

A woman sweeps snow off with a broom in Seoul, South Korea, Tuesday, January 26, 2016. The temperatures dropped to –8 degrees Celsius (17.6 degrees Fahrenheit) in the morning. (Photo by Lee Jin-man/AP Photo)